When middle-school-age children understand the rules of language that indicate how words and phrases can be combined to form sentences, this is called .

Pragmatics

Explanation: Pragmatics involves the rules for appropriate and effective communication. Pragmatics involves three skills: using language for greeting, demanding, etc. changing language for talking differently depending on who it is you’re talking to following rules such as turn-taking and staying on topics

Syntax or Syntactic rule

Explanation:

Syntax is an important rule in the formation of sentences. It deals with the specific use of words, phrases and clauses, punctuation to form a sentence. It's also a rule that guides us as to which order this specific words and phrases are placed in the sentence. Syntax is what we can easily use to identify a native speaker from someone that is just learning the language. The syntactic rule is what can help us to differentiate a language from a sentence or a phrase. Syntax is very specific about its usage.

parts of an essay — traditionally, it has been taught that a formal essay consists of three parts: the introductory paragraph or introduction, the body paragraphs, and the concluding paragraph. an essay does not need to be this simple, but it is a good starting point.

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